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<br />STERLING WATER CONSERVATION PLAN <br /> <br />MAY 28, 1996 <br /> <br />consumptive use credits from agricultural water rights which the City leases to GASP. <br />As the City grows in the future, the water requirements increase. New wells will be <br />required to supply additional water. The City may develop these wells outside of the <br />GASP plan with separate decreed augmentation plans. <br /> <br />According to a recent study prepared by Bishop-Brogden Associates entitled An <br />Amended Plan For Augmentation for the Proposed City of Sterling No. 30 Well, only a <br />small portion of the City's water is used for indoor purposes, or base use. The <br />remaining effluent will be treated at the wastewater treatment plan and either <br />discharged directly to the South Platte River or to the recharge system. Five percent <br />(5%) is generally accepted as the amount of base use consumed. The remaining 95 <br />percent of the base use will be treated at the wastewater treatment plant. <br /> <br />The City may either discharge treated effluent directly to the South Platte River or to <br />the recharge system. During times when the recharge system storage water right is not <br />in priority, the effluent will need to be discharged to the river, When the effluent is <br />stored under the recharge system storage right, the City may take credit for the entire <br />amount of the effluent sent to the recharge system less evaporation from the recharge <br />ponds, In addition to sewer retum flows, the City may also take credit for other retum <br />flows discharged to the South Platte River system in oreler to offset some of the gross <br />depletions caused by pumping wells. <br /> <br />One other source of return flows which the City intends to daim is lawn 9raSS irrigation <br />retum flows resulting from irrigation in the City-wide water system. As part of this effort <br />the City has conducted a study the results of which have been reported by Bishop- <br />Brogden Associates, Inc. in a report titled: Lawn Grass Irrigation Retum Flow Study <br />dated January 1996. This is otherwise known as the Lawn Grass Irrigation Study. The <br />Lawn Grass Irrigation Study detennined that significant lawn and grass irrigation retum <br />flow is occurring in Sterling as a result of high application rates and soil permeability's. <br />Approximately 24.2 percent of the irrigation water applied in the City percolates below <br />the root zone of the grass and retums to the South Platte River system. Additionally, 2 <br />percent of the total outdoor water use is surface runoff from lawn irrigation and retums <br />to the river through the City's storm water drainage system. <br /> <br />IrrigatJonDitch Shares . <br /> <br />Since 1961, new annexations have been required to fumish rfJfN water to the City. This <br />- - - - -- - - - ~ requirement can be met -by-transferrin ditch shares to the City and/or by paying Gash. <br />Table 4 shows the irrigation ditch water rights owned by the City. <br /> <br />Table 4 -Irrigatkm Ditch R!ghls <br /> <br /> Volume l*of Amount <br />Ditch comlXlny (ac-ft/sharelvr) sheres (ac-ft/year) <br />Sterling Irrlgaf10n Co. (Sterllna No.1) 18.51 47.5 879.23 <br />Former's PlOWnee ConoI Co. 42.03 2 84.06 <br />IScrlncxlale DtI'c:h Co. 5.22 14- 73.08 <br />Sterllna Ditch No. :2 Co. 10.63 4 42.52 <br />Taral 7639 67.5 1078.89 <br /> <br />Source: Sterting Public Works Office <br /> <br />Page20 <br />